Tool for facing valve seats



E. O. MYE RS. TOOL FOR FACING VALVE SEATS. APPLICATION FILEDVOCFJ 21, 1920.

Patented Oct. 3, 1922;

Patented Oct. 3, 1922.

NHTED s'raras PATENT FFICE.

EUGENE O. MYERS, DE LOS ANGELES, CALIFORNIA.

TOOL FOR FACING VALVE SEATS. 7

Application filed October 21, 192i). seam. 418,471.

State of California, have inventednew and useful Improvements in Tools for Facing Valve Seats, of which the following is a specification.

tapered valve seats, and an object thereof is to provide an improved valve seat facer that is durable in its construction is simple, and provides a series of relatively separable elements that can, be readily interchanged for renewal.

Another object of the invention is to pro vide for the ready interchange of pilot stems of diiferent Sizes so that a pilot stem may be employed of a size corresponding to that of the valve stem relative to the particular valve seat that is to be faced. In this connection a further object is to provide means for efliciently centering the interchangeable pilot stems so that they will be truly'alined with the valve stem guide aperture and with respect to the valve seat of the valve.

Another object is to provide an improved valve seat facer in which a very desirable rigidity ofconstrmetion and assembly of the parts is secured and to provide for the uniform advancement, of a series of cutters or blades of the tool by the proper centering or guiding of the cutter expander and so mounting it as to eliminate play on the supporting shank and the threads.

Another object'is to provide an improved body block with means for facilitating the effective clamping of the relatively removable cutting members.

A further object'is to provide a valve seat facing tool embodying a series of blades ar ranged around an axis and offset relative to radii struck from the axis to preventv chatter of the tool and to hold the tool to the work.

A further object is to provide a tool of the above character in which the adjustable blades will be firmly held against tipping laterally or longitudinally and will have a substantial bearing surface to obviatethe possibility of their being displaced and to insure their cutting a true surface.

With the foregoing objects view and such other objects and advantages'as may later appear, the invention consists substantially of the construction, the combination. and the details and arrangements of the parts hereinafter set forth and claimed. A prefer'red embodiment of the invention is illustrated in the accompanying drawings, in which: v

Figure 1 is a view of the tool as seen in side elevation. i i I Figure 2 is a view in vertical longitudinal section This invention relates to tools for facing Figure 3 is a sectional view of the tool as seen on the line 3-3 of Figure 2 with the expander removed.

Figure 4; is a view in section and plan as seen on the line 3-3 of Figure 2 with the washer removed.

Figure 5 is a plan View of the retaining washer. i

Figure 6 is a detail vertical section of the blade supporting block;

Figures 7 and 8 are plan views showing modified forms of arrangement of the cut ting blades.

Figure 9 is a perspective view of one of the adjustable blades.

More specifically, 10 indicates a shank member which is here shown as comprising a stem 11 encompassed by a sleeve 12v and fitted witha handle 13. An intermediate portion of the stem or shank is provided with screw threads 14 and is formed with an enlarged cylindrical part 15 providing a centering guide for an expander or sleeve member 16; the lower end of the bore of which sleeve member is larger in diameter than the threads 14 to slip over the threads and slidably fit the part 15. The bore of the sleeve is threaded above the lower por tion thereof to screw on the threads 14:. Below the cylindrical part 15 of the shank there is provided a threaded plug 17, which screws into and through a threaded bore 1% extending through the lower end of ablock 19. The lower end face of the plug 17 is provided with a conical centering seat 20 and has a threaded socket to receive a threaded end 21 of an interchangeable pilot stem 22.

Below the threaded end 21 on the pilot stem is formed a conical shoulder 23 the counterpart of the conical seat 20 so that when the shoulder is seated the stem will be precisely axially arranged with respectto the shank 10. j The stem 22 forms one of a series each of which is of different diameter for the obvious purpose of adapting the tool to be properly centered when grinding valve faces of different valve organizations; the stems 22 being applicable to respective stem guide apertures for the valve stem.

The body 24 of the block 19 is annular in outline, has a flat top face and a tapered bottom face, and depending therefrom is a hub 25 through which extends the bore 18 and in which the plug 1711s screwed. The block 19 is provided with a bore 26 of larger diameter than the bore 18, extending upwardly through the body 24 and through a collar 27 extending upwardly from the. top of said body. The body is provided with a series of guide slots 28 extending through the upper face thereof and alsopextending from the bore 26 outwardly through the block, so that a series of cutters or blades 29 may be readily inserted into the outer end of the guide slots 28 and removed therefrom. The slots 28 may be diametrically opposed as shown in Figure 3 or may be arranged to the side of thediametrical centers a-a of the blOilC 19 and of the shanks and 22 as shown in Figure 7, so that the cutters will be disposed in offset relation to the radii struck from the axis of rotation of the tool; or they may be offset diametrically in relat-ion to each other, as shown in Figure 8.

The cutters 29 are slightly higher than the depth of their respective slots 28 through the body 2 1-, so that they extend above-the flat top face of the body 10 and are therefore. designed to be severally engaged by a retaining washer 30. The retaining washer is preferably of thin and flexible material 1 and is designed to be pressed firmly down on the upper or top edges of the inserted cutters by means of a clamp nut or annulus 31 which is screwed .on the collar 27, and which clamp nut may have a polygonal exterior surface to facilitate the locking of the ring or washer 30 when the nut 31 is screwed down on the threaded collar 27.

The upper edges of the cutters 29 are formed, with side flanges 32 which seat on the top face of the block and support the cutters against tipping movement in any direction and also afford a wide surface for the clamping nut to bear upon. The outer or blade ends of the cutters are formed on an incline, as indicated at 38 in Figure 9, to correspond with the taper of the valve seat to be faced; and are designed to project a short distance beyond the tapered lower face of the carrier block. I

The slots28 extend through the collar 27 and in order to preventthe rotation of the washer 30 the latter may have one or more inwardly extending locking lugs 34 to extend, into the portion of the slots 28 in the collar 27.

When, the several cutters have been arranged in their respective slots in the body block or member 19 the clamp washer can be sure by the clamp nut so as to hold the cutters against ready dislodgment. Then the expander sleeve 16 which has a lower exterior conical end 35 is advanced down the screw threads 14 until it engages beveled upper inner corners 36 formed on the cutters 29, with the result that the cutters will be uniformly moved outwardly by the action of the conical surface 35 thereon.

When the cutters have been adjusted outwardly or inwardly to the desired degree the clamp nut is then set up tight against the washer and this looks the cutters securely in place, with the flanges 32 seating on the block and clamped thereon beneath the washer, the sides of the cutters abutting against the sides, of the slots and the inner ends abutting against the expanding sleeve. The cutters will thus be securely held against displacement. To prevent play of the lower and acting end of the expander 16 its inner surface is' preferably turned cylindrical to closely fit on the guide portion 15 of the stem 11 and the stem is formed with an annular channel 36 beneath the portion 15 into which the inner ends of the cutters may extend when in a fully retracted position.

In the operation of the tool, a shank 22 is placed thereon according to the size of the valve stem guide opening of the valve seat to be faced and is inserted in the opening to center the tool and hold it relative to the valve seat. The cutters are then adjusted to conform to the valve seat and the tool is oscillated through the shank in the manner common to tools of this character, so as to cause the edges of the inclined faces of the cutters to scrape theinclined face of the valve seat. 7

lVhile I have shown and described a specific embodiment of my invention I do not limit myself to the exact construction and arrangement shown, but may make such changes as may come within the scope of the appended claims; for example, any de sired numberof cutters may be used, and in some instances the locking washer may be dispensed with.

In a co-pending application filed February 3, 1920, Serial No. 356,065, I have set forth a tool similar to the one disclosed herein, which application embodies broad claims based onthe slidably mounted cutters arranged in open ended slots with means for uniformly advancing the cutters, and I therefore do not claim in this case any invention except those specifically set forth in claims hereof.

I claim:

1.. A valve seat facer including a block, a shank secured in said block, a screw thread and a cylindrical parton said shank, the cylindrical part being below said screw thread, a sleeve having an internal thread to fit the thread on said shank and the bore of the sleeve below the internal thread being larger in diameter than the thread to fit closely onsaid cylindrical part, said block being provided with a plurality of outwardly extending slots, and cuttersin said slots, the inner upper corners of said cutters being beveled, the lower end of said sleeve being conical to engage the beveled corners of said cutters to force the cutters outwardly on advancing the sleeve on the screvthreads, said cutter having side flanges on their upper edges seating on the upper face of said block, and means screwed on the block for clamping the flanges of the cutters against the block.

In a tool for facing valve seats, a block termed with a central bore and having slots leading outwardly from said bore and opening at the periphery of the block, cutters slidably arranged in said slots having inclined outer end faces projecting beyond the edge of the block, side flanges on said cutters seating on the top face of the block, a shank extending into the bore of the block having a threaded portion, a sleeve screwed on said shank having a tapered end adapted to bear against the inner ends of thecutters, a clamping nut encircling said sleeve and screwed on the block adapted to clamp the flanges of the cutters against the block.

3. In a tool for facing valve seats, a block formed with a central bore and having slots leading outwardly from said bore and opening at the periphery out-the block, cutters slidably arranged in said slots having inclined outer end faces projecting beyond the edge of the block, side flanges on said cutters seating on the top face of the block, a shank extending into the bore of the block having a threaded portion, a sleeve block, a washer interposed between the clamping nut and the cutters, and means for holding the washer against turning on the block.

4. In a valve seat tacer, a body block formed with open ended slots, cutters slidably mounted in said slots having side flanges ontheir upper edges seating on the upper face of said block, and means for clamping the flanges of the cutters against the block.

5. In a valve seat facer, a body block termed with open ended slots, cutters slidably mounted in said slots having side flanges on their upper edges seating on the upper face of said block, and means screwed on the block for clamping the flanges of the cutters against the block.

6. In a tool for facing valve seats, a block having slots leading outwardly and opening at the periphery of the block, outters slidably arranged in said slots, side flanges on said cutters seating on the top face of the block, an externally threaded collar on said block, and a clamping nut screwed on said collar, adapted to clamp the flanges of the cutters against the block.

EUGENE O. MYERS, 

